Brush-holder for electric motors or generators.



E. A. HALBLEIB. BRUSH HOLDER FOR ELECTRIG MOTORS 0R APISLIOATION nun) NOV. 29, 191

GENERATOR&

. 1,078,194, Patented Nov. 11, 1913.

UNITED STATES PATENT OFFICE.

EDWARD A. HALBLEIB, OF ROCHESTER, NEW YORK, ASSIGNOR TO NORTH EAST ELECTRIC COMPANY, OF ROCHESTER, NEW YORK, A CORPORATION OF NEW YORK.

BRUSH- HOLDER FOR ELECTRIC MOTORS OR GENERATORS.

Specification of Letters Patent.

Patented Now 1 1, 1913.

To all whom it may concern:

Be it known that I, EDWARD A. HALBLEIB, a citizen of the United States, and resident of Rochester, in the county of Monroe and State of New York, have invented certain new and useful Improvements in 'Brush- Holders for Electric Motors or Generators, of which the following is a specification.

This invention relates to bruslnholders such as are employed in connection with the commutator-brushes of electric motors or generators of the dii'ect current type.

The invention relates particularly to brush-holders of the form in which. the brush is supported by a pivotally-moval'ile member, which is mounted, either directly or indirectly, upon a supporting-rod fixed on the frame of the motor or generator in a position parallel with the armature-shaft, the supporting-rod constituting an electrical conductor through -which connection is made between the brush-holder and other parts of the electric circuit.

The object of the invention is to provide in such a construction a novel and simple arrangement for both securing the supporting'rod removably inplace on the frame of the machine, and providing electrical connection between the rod and the conductor or conductors by which the rod, and the brushes supported thereby, are connected with the electrical circuits of the machine.

To the'foregoing end the invention c011 sists in the construction hereinafter described, as it is defined in the appended claim.

In the accompanyin drawings:-Figure 1 is an end-view, partly in vertical. section,

of an electric motor or generator provided with brush-holders embodying the present invention; and Fig. 2 is section on the line 2-2 in Fig. 1. s

As the brush-holder constituting the present invention may be employed in connec tion with any ordinary form of direct-current motor or generator, the drawings illustrate only a portion of the machine in connection with which the brush-holders are used, including one end of the armature (t. the RI'H'HLtJLUB-Sllaft7,0110 of the hearings in which the shaft is supported, an endplate 12 of the casing, and the commutator 9 mounted on .the arnuiturc-shatt. The brushes 10 are of a well-known arcuate form,

being so supported as to swing toward the commutator in circular arcs concentric with pivotal supports or rods 11. These supports are mounted at their inner and outer ends, respectively, on the end-plate 12 of the motor-casing and on the support 13 by which the shaft-bearing 8 is carried, and they are thus held parallel with the armature-shaft.

Each brush 10 is fixed upon a yoke-shaped brush-carrier having two parallel sidemembers 14, and a middle-portion 15 which is provided with a cylindrical surface upon which the brush 10 is seated, the brush being fixed in place by means of a clampingscrew 16. The lower ends of the side-members 14 are perforated audprovided with bearing-bosses 17 so that the brush-carrier may be pivotally mounted upon one of the rods 11, about which it swings freely.

Near its upper end the brush-carrier has an outward extension formed by a continua tion of theside-members and an extension 18 of the middle-portion. This extension 18 is curved inwardly at its outer extremity,

forming a. lip 19 which is perforated at. 20 e to receive the outer end of the coiled tension-spring 21 by which the brush-carrier is controlled. The spring 21 is located between he side-members 14 of the brush-carrier,

supporting arm 22 which has a perforation 23 for this purpose near its upper end. The arm 22 is mounted upon the pivotal support 11 between the side-members 14 of-the corresponding brush-carrier, and to prevent r0- tation of the arm upon the support the support has a. longitudinal flattened surface,

shown in Fig. 1, and the arm .22, as shown in Fig. 2, has a perforation so formed as to fitv against the tlattenedsurface, thus fixing the arm rigidly against pivotal movement. Accordingly, the spring is subjected to tension between the arm and the brush-carrier. with the result that the brush is held,yie1dingly against the commutator in the usual manner.

When the brush has been worn down to a point at which the tensionof thespring has been relaxed to the effective minimum it is desirable that further inward movement of the brush-carrier--be arrested, and. for this purpose the spring'supporting arm 22 is utilized as a stop, being provided, at its 'and its inner end is fastened to a springupper end, with a lug or abutment 25 adapted to engage the middle-portion 15 of the brush-carrier. The rods 11 are utilized as electrical conductors to the brush-carriers and the brushes, and the present invention resides in the simple and effective means employed for the double purpose of removably fixing the rods 11 in place, and at the same time making electrical connection between these rods and the other parts of the machine. As shown in Fig. 2, the inner end of each rod is insulated and'supported by means of a bushing 26 in Which it is loosely mounted, while-the outer end is insulated by a, bushing 27. The outer end is also provided with a flat metal arm 28. This arm is pinned or otherwise fastened rigidly to the rod 11, and the outer portion 29 of the arm is reduced in thickness and is secured by means of a binding-postBl, which passes through the arm and through an insulating-bu'shing in the bearing-support 13, thus serving the double purpose of preventing endwise or rotative movement of the arm and the rod, and of constituting a means of connection with a conductor 31, which extends to the field-winding or any other suitable partof the machine.

W'henever it is necessary to dismount the In Fig. 2 the brush-holders are shown as used in pairs upon each side' of the commutator, but manifestly they may be used either in greater numbers or singly.

I claim In an electric motor or generator, the combinzitiom-n-ith a frame-member thereof, of an insulating-lmshing therein, a rod mounted loosely in said bushing,a brushholder supported by the said rod, a rigid arm fixed to and projecting laterally from the rod, and a binding-post connecting said arm and said frame-member, but insulated from the latter, the binding-post normally fixing the arm against movement, and the arm acting both as means to prevent movement of the rod in said bushing, and as an electrical connection between the rod and the binding-post.

EDW'ARD A. I-IALBLEIB.

VVi tnesses THOMAS L. LEE, D. GURNEE. 

